Searching for the roots of the bar chart! 📶🤓 I found this mind-blowing flood diagram (1784) during my research for *History of Information Graphics.* It documents flood levels on the river Elbe near Dresden. https://t.co/Pfl4FZxSng pic.twitter.com/Df1kp1igMA — Sandra Rendgen (@srendgen) July 8, 2020